I implemented a resource class that supports a series of extended properties and I see that OSLC4J does the job of mapping Java types to corresponding RDF types.

Only for extended properties of String type, is it possible to inform OSLC4J not to add the 'rdf:datatype="http:/www.w3.org/2001/XMLSchema#string"' to the corresponding XML element in the serialized RDF XML file ?